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DERIVATIVES AND HEDGING ACTIVITIES (Tables) | 3 Months Ended
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Mar. 31, 2022
Derivatives, Fair Value [Line Items] |
Effect of Cash Flow Hedge Accounting on Accumulated Other Comprehensive Income (Loss) | The table below presents the effect of the cash flow hedge accounting on accumulated other comprehensive income (loss) for the periods indicated:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) |  | 2022 |  | 2021
Gain (loss) recognized in other comprehensive income | ​ | $ | 6,852 | ​ | $ | 4,948
Gain recognized on termination of derivatives | ​ | ​ | — | ​ | ​ | 16,505
Loss reclassified from other comprehensive income into interest expense | ​ |  | (31) | ​ |  | (854)
Designated as Hedging Instrument |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022 | ​ | December 31, 2021
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(Dollars in thousands) |  | Count |  | Amount |  | Assets |  | Liabilities |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): |  |  |  | ​ |  |  | ​ |  |  | ​ |  |  |  |  | ​ |  |  | ​ |  |  | ​ |
Interest rate swaps related to FHLBNY advances |  | 4 | ​ | $ | 150,000 | ​ | $ | 11,240 | ​ | $ | — |  | 4 | ​ | $ | 150,000 | ​ | $ | 4,358 | ​ | $ | —
Not Designated as Hedging Instrument [Member] |
Derivatives, Fair Value [Line Items] |
Fair Value of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2022
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 20 | ​ | $ | 115,621 | ​ | $ | 4,258 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 162 | ​ |  | 1,051,421 | ​ |  | — | ​ |  | (50,760)
Loan level interest rate floors with borrower | ​ | 1 | ​ | ​ | 23,769 | ​ | ​ | 9 | ​ | ​ | —
Loan level interest rate floors with borrower | ​ | 42 | ​ | ​ | 334,329 | ​ | ​ | — | ​ | ​ | (5,559)
Loan level interest rate swaps with third-party counterparties |  | 20 | ​ |  | 115,621 | ​ |  | — | ​ |  | (4,258)
Loan level interest rate swaps with third-party counterparties | ​ | 162 | ​ | ​ | 1,051,421 | ​ | ​ | 50,760 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties | ​ | 1 | ​ | ​ | 23,769 | ​ | ​ | — | ​ | ​ | (9)
Loan level interest rate floors with third-party counterparties |  | 42 | ​ |  | 334,329 | ​ |  | 5,559 | ​ |  | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | Notional | ​ | Fair Value | ​ | Fair Value
(In thousands) |  | Count |  | Amount |  | Assets |  | Liabilities
Included in derivative assets/(liabilities): | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Loan level interest rate swaps with borrower |  | 98 | ​ | $ | 599,003 | ​ | $ | 27,440 | ​ | $ | —
Loan level interest rate swaps with borrower |  | 87 | ​ |  | 612,610 | ​ |  | — | ​ |  | (12,620)
Loan level interest rate floors with borrower | ​ | 33 | ​ | ​ | 291,990 | ​ | ​ | 615 | ​ | ​ | ​
Loan level interest rate floors with borrower | ​ | 12 | ​ | ​ | 100,774 | ​ | ​ | — | ​ | ​ | (53)
Loan level interest rate swaps with third-party counterparties |  | 98 | ​ |  | 599,003 | ​ |  | — | ​ |  | (27,440)
Loan level interest rate swaps with third-party counterparties | ​ | 87 | ​ | ​ | 612,610 | ​ | ​ | 12,620 | ​ | ​ | —
Loan level interest rate floors with third-party counterparties | ​ | 33 | ​ | ​ | 291,990 | ​ | ​ | — | ​ | ​ | (615)
Loan level interest rate floors with third-party counterparties |  | 12 | ​ |  | 100,774 | ​ |  | 53 | ​ |  | —
Loan Level Derivative Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
(In thousands) |  | 2022 |  | 2021
Loan level derivative income | ​ | $ | 6 | ​ | $ | 1,792

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